Whirlpool du3003xl-0 pump housing leaking

[mytechtime]

Hello, I have a 1980s du3003xl-0 that I recently picked up. Today, I went to test it, and everything worked, except there was a small leak under the unit. I unplugged, and upon further investigation, I think it's a gasket.
The previous owner didn't use the machine for two years either.

I believe I need this to fix the unit, but I don't want to waste $20 for something I don't need.

http://www.repairclinic.com/PartDetail/b5p9/Whirlpool-Dishwasher-Pump-Gasket/717000/3396?modelNumber=DU3003XL0&ss=a9b5d103063&mr=1